On this edition of Representing Border the Prime Minister brings his election campaign to Scotland to tell voters there are no circumstances in which he'll allow a second independence referendum, even if the SNP win a mandate at the next Holyrood election. But as the Tory leader flies north the First Minister demands he apologises for what she calls the chaos he and his party have caused in recent years. The Scottish Liberal Democrats formally launch their campaign with a pledge to halt Brexit and independence. While Labour make the case for investment in business. Joyce McMillan and Gina Davidson join Peter MacMahon to consider the first days of the election campaign.